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Although Guttmacher was probably [[circumcised]] on the eighth day of life in accordance with the [[Abrahamic covenant]], and would have no personal experience of a [[foreskin]], he claimed expert knowledge. As a [[circumcised]] doctor, one would expect him to be biased in favor of [[circumcision]]. In 1941, Guttmacher erronously claimed that the presence of a [[foreskin]] would cause dirt to collect under the [[Foreskin#Foreskin_in_infancy_and_childhood| foreskin in newborns]]. He spread the false claim that a baby's foreskin must be forcibly retracted and scrubbed daily which is basically impossible without violence due to the [[synechia]] which adheres the foreskin to the [[glans]]. He promoted mass [[circumcision]] as a means of blunting male [[Foreskin sensitivity| sexual sensitivity]].<ref name="Guttmacher1941">{{REFjournal